Help? P04db crankcase ventilation system disconnected
#1
Member
Thread Starter
Help? P04db crankcase ventilation system disconnected
Installed a cai on 3.5 ecoboost and i keep getting this code..
I cleared it and everytime i floor it it comes back
p04db crankcase ventilation system disconnected
I cleared it and everytime i floor it it comes back
p04db crankcase ventilation system disconnected
#5
Official HTT Greeter
I don't have a CAI, EB, or the error code... but, the crankcase should have a breather hose/pipe that goes to the intake. If you removed or modified this breather hose then it's possible a sensor noticed the change. If your CAI didn't modify this, then it could be a bad sensor.
#6
Junior Member
I sure hate to resurrect a dead thread, but it may help someone down the line. I had the same issue today. I have no modifications on the engine at all, but I had the oil changed a couple days ago and that was the issue: they didn't seat the dipstick all the way into the valve cover. It looked fully inserted, but it wasn't. I only noticed it because as I was taking the engine cover off to get to the sensor I saw what looked like a little bit of oil spray above and to the side of the dipstick, near the master cylinder and power steering unit. It wasn't hard to see where it came from after that. So make sure your dipstick is fully inserted AND that the o-ring on the end of it is intact.
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#8
Senior Member
#9
I sure hate to resurrect a dead thread, but it may help someone down the line. I had the same issue today. I have no modifications on the engine at all, but I had the oil changed a couple days ago and that was the issue: they didn't seat the dipstick all the way into the valve cover. It looked fully inserted, but it wasn't. I only noticed it because as I was taking the engine cover off to get to the sensor I saw what looked like a little bit of oil spray above and to the side of the dipstick, near the master cylinder and power steering unit. It wasn't hard to see where it came from after that. So make sure your dipstick is fully inserted AND that the o-ring on the end of it is intact.
Now my question, which makes absolute sense to me, is that if I would have had a problem after I installed the cold air intake it would have occurred immediately or very soon after, not after more than 6000 miles while the vehicle was in for an oil change. Sensors are going to pick up changes in a matter of minutes if not instantly. So my question would be what else has anybody experienced or had a dealer tell them the problem was (LEGIT or BS) or try to blow smoke up their ***, with regards to this known problem. It doesn't affect everybodys truck, but when it occurs the dealerships seem to have no idea and simply looks to absolve themselves of any responsibility by saying it's your aftermarket cold air intake. Apparently simple troubleshooting is a lost art.
Anyone?
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RKAsF150 (01-27-2021)